My concern is not only do they destroy their health but effect other people's health in their vicinity..nearby ..passers ..NON SMOKERS 

PLUS ..have they thought that some people wear contact lenses and smoke getting into their eyes can cause serious  complications to the eyes. 
https://www.dailymail.co.uk/health/article-13438827/vaping-e-cigarette-lung-cancer.html

But there is a solution ..those who smoke can always look for another planet and all can get lost there and smoke themselves to death ..end of smokers 

The Great Spiritual Master GURU GOBIND SINGH JI totally banned all his Khalsa devotees to refrain from smoking